5 Nov
2000
5 Nov
'00
12:41 p.m.
On Sun, 5 Nov 2000, Claude wrote:
Bill Dawson wrote:
> disks. The only markings on Q1, TO-92'ish, are A854 (date code or
> 2SA854?) and S G D. I think this device is in the circuit to save
Quickly I would say its a 2sa854 very common but S,G,D
should be for
Source, Drain, Gate for FET transistors...could be a fet with that
number...
I use this part at work all the time. It is a 2SA854, simple bipolar PNP,
I(c) of 500 mA maximum, just a general-purpose transistor. The SGD on the
bottom is probably a lot/date code. The leads are, facing the side with
the markings on it, emitter/collector/base. This is why shorting the
first two makes it work.
Make sure you have proper signal at the base, then replace if necessary; a
2N3906 will sub but has a different pinout and (I think) not quite the
same I(c) rating. There is a spec sheet at the Rohm website.
Richard Schauer
rws(a)enteract.com